![-- (Credit: SHYAMAL) -- (Credit: SHYAMAL)](http://cdn.downtoearth.org.in/image/20070815/26.jpg)
If households in Delhi replace four ordinary bulbs with four compact fluorescent lamps
(cfls), their annual savings would be around Rs 273 crore. Startling figure. The highly energy inefficient incandescent light bulb is on its way out. Replacing it is the new-generation and more energy-efficient
cfl (see box
Energy efficient). Brazil and Venezuela initiated the process of phasing out incandescent bulbs. Australia plans to do it by 2010 and Canada by 2012. Other countries--New Zealand, Netherlands,
us--are also planning to phase out incandescent bulbs.
In India, however, there is no formal plan to phase out ordinary bulbs yet. There is a debate over the amount of mercury that
cfls may emit and concerns regarding its disposal.But pro-
cfl groups say that mercury emissions from thermal-based power plants are much higher, compared to
cfls and hence, the fears are unfounded. And, given the power crisis in the country, it is only feasible to convert to
cfls (see box
Advantage CFL).
Toxic mercury
cfls contain small amount of mercury--about 3-4 milligramme (mg). While mercury gives the
cfls an added glow, it is also toxic. High levels of mercury intake can damage the brain, the reproductive system, foetuses and cause behavioural problems. It has a tendency to bio-magnify in natural conditions.
However, there are advantages because
cfls help in curbing greenhouse gases (see table
Environmental pollution and resource consumption). Hence, the question that emerges is how will
cfls impact the environment after they exhaust 7,000 hours of life? Calculations prove that mercury emission from
cfls will be 4.32 times lower than incandescent ones, considering if electricity is supplied to incandescent bulbs by coal-based thermal power plants (see table
4.32 times lower). No laws for disposal and recycling of
cfls, however, makes it tough. Given the scenario, there is the possibility of mercury spreading in the atmosphere. Coal-based thermal power plans also emit mercury--about 65 tonnes on an average through combustion of coal annually.
The emission of mercury from coal-based power plant, however, is point source (through chimneys). But controlling emissions from diffused sources (uncontrolled and random dumping) like
cfl is a more difficult task. And it is anticipated that as the
cfl-use goes up, the problem will assume alarming proportions. The solution, experts say, is to frame strict laws, give incentives for recycling and have buy-back policies in place. There should be written instructions on precautionary measures and ways of using and disposing
cfls.
Technology exists to segregate glass, phosphor powder, mercury and other materials from expired
cfls. Canada, for instance, has recycled 7 per cent of fluorescent bulbs. To reclaim mercury from fluorescent tubes, the tubes are placed on conveyer belts and crushed in a crusher. Then, after a series of stages, mercury is baked in a vacuum oven for up to 12 hours. It is then cooled, collected and sent for purification.
High production
Despite the constraints,
cfl production in India is on a high. Production has increased from 6.4 million to 44 million in 2005-06.
![Down to Earth](http://cdn.downtoearth.org.in/image/20070815/27T.jpg)
It is estimated that India will save around 12,000
mw and reduce
co2 emissions by 4 per cent. According to Greenpeace, "if all regular bulbs in India were to change to
cfl, 55 million tonnes of carbon emissions could be avoided", which is equal to 30 per cent of the emissions of all vehicles in India.
According to Delhi's electricity provider,
bses, around 400,000
cfls have been distributed under the 'buy one, get one free
cfl' scheme. Delhi has saved 25
mw. The scheme stared in October 2006. According to estimates, Delhi could save around 450
mw if ordinary bulbs are replaced by
cfls. Not much reason why the rest of the country shouldn't follow the example, but with a proper disposal mechanism in place.